inDecember1952,averythickdarkcloudcamedownoverlondonInDecember1952,averythickdarkcloudcamedownoverLondon.Itwastheworstsmog(烟雾)Londonersneversaw.Muchofitwasbadfactorysmoke.Nearlyfiftypeoplediedinroadaccident

　　inDecember1952,averythickdarkcloudcamedownoverlondon

　　InDecember1952,averythickdarkcloudcamedownoverLondon.Itwastheworstsmog(烟雾)Londonersneversaw.Muchofitwasbadfactorysmoke.Nearlyfiftypeoplediedinroadaccidents.Butmuchmorepeoplefeltill.Thesmogwasverydangerous,especially(尤其)foroldpeopleandyoungchildren.Thestreetswerenearlyemptybecausepeoplestayedathomemostofthetime.Theairwasverythickandpeoplecouldalmostcutitwithaknife.Thesmellfromthesmogwasverybad.

　　Afterthreeweeks,thesmogslowlybegantolift.LifeinLondonbegantochange.Butinthenextweeksandmonthsover4000peoplediedasaresultofthesmog.

　　()6．The1952smogwasinthehistoryofLondon.

　　A.thelongestB.theworstC.themostdangerousD.thebest

　　()7．Thesmogkilledpeople.

　　A.50B.4000C.over4000D.400

　　()8．Howlongdidthesmoglast.

　　A.ThreeweeksB.ThreemonthsC.ThreeyearsD.Threedays

　　()9．InwhichseasondidthesmogcomedownoverLondon?.

　　A.InspringB.InautumnC.InwinterD.Insummer

　　()10．Whydidthepeoplestayathome?Becausetheywantedto.

　　A.behealthyB.dohousework

　　C.havearestD.enjoythemselves